In this study, a new radiometal-octabromoporphyrines was developed and the possibililty of application for a new tumor imaging agent was examined. As a result, it was found that Octabromotetrakis (4-carboxyphenyl)porphine（OBTCPP） could be very rapidly radiolabelled by 111In, a radio nuclear for diagnosis. It was also found that, in tumor bearing mice transplanted colon26 tumor cell, 111In-OBTCPP was accumulated in the tumor at about 5%ID/g, and tumor to muscle ratio was over 10. Furthermore, in SPECT-CT imaging study, the image acquired 24 h after injection reflected bio-distribution study, and the tumor was visualized. In conclusion, 111In-OBTCPP has possibility of application for a new tumor imaging agent.